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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976e5d3625aba58d9af213ee55fb17e281cae13d05fa30f80305b624ea44b48e' 
  AND token = '2k1+PZdlhwBZax/GTcHe8FOXdlXDWJGognneL/19LD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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