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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a7c44f3867bc5f874bcabf041dfe32264372c46b2c8632946f9560c54e4d18' 
  AND token = 'yEI+P/wkramToADSdC1xewTZefuVwq/Zcg5Zib/wlCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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