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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677296a945cc2e51798fcf9775940cef9ec13045f3930cc21910913251da2a0f' 
  AND token = 'nCcEtYzN2CyVXscE3Cuvk6hEtLDeyeWW7U7jAJ77KBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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