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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30bc5830e7dc035cd131803c8185cc4be589e67c4b1e562716b88882eabdcc4' 
  AND token = 'tS8lCFAkczxu04zjh/tKJLHXgu7n9Za7hmF4TfSPG3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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