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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a27cf60f0e980b5a27b5a1ec3b1e488f6dc8a6e4d5578a6698ce0dd05975ba9' 
  AND token = 'pLf6l4fGrVpcjvUOY+4q8kr3Z+a1hCBkOIPOVDbRMDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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