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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c26a807a0d61f2c0098158c59617fcbe4db54c94cac49ce3578ae3aae01a39' 
  AND token = 'An3RP99CyZiFH9nrRWYocYuN9PTLlyRD75YinEWIh18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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