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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca5ed8ede4a9c4a52ea9e7290f0fe41ad5a8ec696a6460c9333ab4660077ca3' 
  AND token = 'MOzgwjq4jdLtOjXLfBcNLjH5vnn6KLvLbneJtJwdyhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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