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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa674aede9d917cb1433b6e5ea52c0aa3e3ee24e95830b2d7d94fe88515f2f88' 
  AND token = 'tq1rc3XtuusKwRbDQ6BB2963stpSlzFzL6zGQoXPT5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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