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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becb8113d457a3cda445c7f463da45d8cac4c76cb44b5fd7aadde23e6358723c' 
  AND token = 'uhk36PrP5P8ILAMj89+q5i+qVSzVSBhCk2XFhlxdOOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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