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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1712bc7b92592ac5e0e7c9a0f9eac7f427fd0bffa099f3acb96f190ae1ce827' 
  AND token = 'vqVTnMl+CQ8V1LnWwsEueWu7pSa0u5jpNoQBvcn0oeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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