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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363bc23e128a5aef1ea02fc90a91e9afac24e0b3df0e3a23b470031ecb47e05b' 
  AND token = 'kB4sd2cd+whwwVUOlyEA9DlyA1vMIhk/xSqGgJc3RqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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