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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d3a25d91e927a60a68a37e61987a78cd1d4a75dc80e5e837a085c9a5f08b12' 
  AND token = 'Cpui6Ilv5YH4H5tbAsmFdVFCVNh8ntckQQtZQ6mUkpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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