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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31534a421723d1b0553461fe7aeda7cdb95bb6aab035938d710e330f5027a38e' 
  AND token = '0/B6ZaWydkQqh2uZLTR7oUws+NzdfaJxyeGA7nuMvL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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