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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bc7ecd596a7db2322db9621151a71fb7b182fe6adcdc1bf23a309801c746ca' 
  AND token = 'zrgM64fkYNcYzB7hHIy+6t0sf+CrvgcNZ0Pt+j4a4fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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