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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29129d35dca3ef6859b2aa5a0a73e0569f6c80ae43280f2877a9e1428ce0584' 
  AND token = '667Qq+QeCwiPfz1rmiygFsFngT4AjWY6OTzJeYiBXXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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