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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7279e0c18c4a8b7a73267071af726cc198f3fdfe2eff4aba0ac8eaa9dd4fac7b' 
  AND token = 'RPCd3vAlIfWvpYfp/u7AiKZ4+GjxdSB7XpynUyk7GP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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