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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3e747c78a7d3ddad06ebb6c4145eee4547e91d56bb839505ad5c94d456aaba' 
  AND token = '6g4pw3BfxtHGfZCGxgG0uw/2VvgyYRvLODt3LNeDiMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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