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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a139ccb04baa550a4bed3058faedc8320670a5c16cef87eba14670c7596ef7b' 
  AND token = 'P1BcCvWnK0nJNoAtYTJDAI61jqTtsoFjoAzX3Dk7ZNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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