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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc3e468e9df968cff01a97341a16ae051da8fb163058c801c5ad508b512c50f' 
  AND token = 'rHVhRLQW01CCvZlXDEg1OagOkNB1zrrj3/nwf/CcZeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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