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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a1f9f1880de80d4c5e857aac9d30332c19ecded0701660419f39a223b6f228' 
  AND token = 'SSz+yqbG0rGTExCUMRl+QOzWNYFCT2R3DeoHkpLPNus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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