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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f24a863ba9b7c17e45d4018cd0937d6bc26e5806c5b00da0eece202e7723a3' 
  AND token = '/JnbTZsu2kCpcKqL/iwSYER7IwfvOFpp2fDkSKV0K+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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