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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b985afad08b4d694d6c1ccea0b59d33afb827ef9b9274e40bf6e205882ead435' 
  AND token = 'GWcaffDzHt9f5SU5spKPMcsA6R0FEuq/gTtMFsZQiAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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