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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dabf083c1d618a649c01140bd70338bd3e0705099c2eb7ca17835e448dcb76' 
  AND token = 'RfWbgpcB8V4Ekxi1ZBKT4HLvDiFXtirHDMBovr4k1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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