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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3630d8a14eab2b26249a6511d1c8df358bb4b7e7c30a46f5d5d5beac66dabe09' 
  AND token = 'G6PRi3H8EzE5YUNAaRmNWeGSiK1f3eiGCPxuQexOd6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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