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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d8554b9017af07a9221aaa2bab359caa96de06db6372fc92fc00016dde10df' 
  AND token = 'nI9n/1dE4nSsyjPoRvSZbFiyZ+/2b/tyvaQc0E6VG4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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