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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3352982ab8934c15017caeb8a4b30fc9bcefbb613a8bc004e09d05a45d3c4e02' 
  AND token = 'RW7+Yf9B2ejyxhMcaCJeFKGE/HX5UrR3eFbL2ltTI3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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