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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800c5cdb8d6965df778dae2e3c5541ca0676e08d7c4e93cda628b7ce2deb367a' 
  AND token = 'cUY2kSOWLbqflMc3MsNs3q8DF4sLf+dlw122zAZ4kHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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