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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2078cbe138ee1e5c6592d1968b8bb14a0db0778c3f5523987a45e640cb45daa' 
  AND token = 'gWv6gQhT7tczbnlWvCDB3gSkjxOnpWJXXWh6gez/kzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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