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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c00bd6ebb9ee7efa5315c4a058c9c305e05a791b9db0065819f40a88f33d5d' 
  AND token = 'ErUvdhsfXfMegHVgops3JplgYMRqLJpd5RctdPwO9gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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