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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93d6513eba60c45a713ece7670dc81f51b2958dbcce22b271eeed1e4926f1d1' 
  AND token = 'Z+594fg3VjByfkV9TtT1srHyyFKBnKGsWocdCds/hLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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