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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7206fe2f466eacdb1d3548211f5c7d8b3be475ce92d4d0c3fe5555fedd15c54a' 
  AND token = 'cDpN6YZfatPJ804j4WpMj8kkHwzCYS38KSeuzSi49N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}