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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585e2bb6e943321a347e80509f8c836c397151cd8197136d8b08524c059a42fd' 
  AND token = 'dPOsWt7K/7m+3/G+mxb6esuP0j3GRyITbdqTIX8t0sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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