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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea95ab27b545325f904216199af73e811dca09568c3daa289a3c653a988a8e5a' 
  AND token = '1v6xoU5XgRknkVL4n3JfvKEJvQeAcQc2ZzO0kJszvS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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