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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb707251e6ca037c568ba40b79ff90c322f3567bc320b7c8cc163c1f4816b44' 
  AND token = 'aet1zDWW4DAFjBe5AEWvJ6GIyQ7V3zjMUhOdplYOzZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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