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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce94fc0033e3f85947018ead4677db1ac71f6a031f2567d5c4beba7bcaea9fbe' 
  AND token = 'so0692AVwiN9cyws1IeI6OJ+4IB5VaZp3PRFTaRWVXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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