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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ed3a955c665fc06919d9de3fa8b9ecf5a3922f3ba9b71fe154dda31a8e05b7' 
  AND token = 'gMx8hXYZez5yVUgKtRBsQz64iStqMcEsCHsFiLAhLz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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