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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30bf33fc164558037f5742484f81982927514e47f49d6a4d5680624f133a592' 
  AND token = 'qB8arK9idRTB755BlM7YvtfB4wbIr6YF0xCugNIGTjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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