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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17a5ff63cc878c49133320b59175c4769da13d2050939c4a99e78ba8bbbc712' 
  AND token = 'HqZW1On/UvEmmMTvYhrsmI8lOa3JpY/+5i3boyNKmCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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