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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037ee5f0cdbff2908dfdb6d8dfdf31fc14136f74a49b23f2488b6b2c2a6f3f61' 
  AND token = 'Z7Hc0CjSS/bfkpnz4GPG3Jkb/8j0L/9io2gkc0XrozI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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