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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dfb3e39a26b9c9f29542db37d2b55924c321a7d8d33c55564c5d76d45b0338' 
  AND token = 'RWYLApEUeTJEvdcG7VMdgr9JqFyRXPiMQCPoEwPy7xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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