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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bb30322c007f7ec67f92fc5210730e8d3dc0f04afd96003d1e70ffb32ff524' 
  AND token = 'WhWfTkq2WLYS+/wG7yf2/clC4BvZz5A8kfRz+fw6+XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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