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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546312b77ae4241d1ab28e86cfd9bfa3dbf840bdec32428dc97228c0c79183d1' 
  AND token = 'vMKem7nvM/YH4oWI9gBWQMPc8J6DsF5zh85pQYNNTbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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