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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f79ce1c7d2152ec1a671432c371b6889e4706ca0d7b76e1ff4ef27b13fd323b' 
  AND token = 'ip17F3iqihp3eefk8nIR8HKhrbS0u2wYcRsi+wqCrwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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