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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0854420cc1907bab70cc8ecd5243b45c20d9d3c1492d301145d0f4b3965042cd' 
  AND token = 'Lq6EJvJG0IfYQz/tbbRc7/+1PInvlg9En4pfkpIxyyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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