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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771ba891bd616be94eb3ff1ddc5b010878b62cf317c5a5e049253e5444f01ad2' 
  AND token = 'mACKUkmW0L+JgUaPABld1s28qsWWiAUTsCAxt/BETlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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