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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a9ac053302524ab1ee14a6d4a425f49d8dccebbaa47b1d8228f6923f6c03f0' 
  AND token = 'YkE5aPM2SW1Ptj2se5GZ1F62nyP1wOt9JmiVXO79/H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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