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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada9b1d846c29151ffd60310cca4064d7c9f73342a29f2aebcb21f46c1b525c6' 
  AND token = 'RFZJo84plKqdIo7cvskQP7srGFKacpSw65Rca+UQ3wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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