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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18daaf84e81586185dc0b8bb769c18af233396ef9aff0a23283f258d00daca98' 
  AND token = 'R2JDgBQi+seNj47iQjaKMwZzPNf3cckfzCWhmyw52pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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