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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e8f277dc85a0c182cf0bd92e4733c2306e52b31c8c32bc2f124290e2bb42bb' 
  AND token = 'U1mvTg2RZYjouwOvjWwlgo4JNZPexqnXNymIvdXOs7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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