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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cb36143ad918c5dd38e95b2de544d81906d5556951f16d588cd52937e91636' 
  AND token = '4G09l9xp5GwXyrCW0CeEAhUtHFFIB83OQ8Z2wePLiXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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