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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789d1e86a54920519ba1788f3649434b882c9cff4564a716b9ae599393d5d9ab' 
  AND token = 'Vt6dVqtpBb+3/Mbx0daB41dpuFX9ZkJGpTVEgCHICo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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