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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db41c7745def534870c89dc9ca6490ed995e72a605719bc5356387e37f1df6a' 
  AND token = '/dcBjh2dtjNfiLW+iLuI1bLHoXAgDt/E/rXcboxfDGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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