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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79379746ee66c69a38c3f7711701ef73088e79ea446b8dd5a04585206ec329cc' 
  AND token = 'CW0NUxHXg9pZFwagrzP7/GGB506ffMwaKSaRNY2C9+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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