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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b068d9e5d392dff953de1cb232683fb59ea07aba2f34e500cba5555bde6931b' 
  AND token = 'BByg+fJk7LjE1tASTTgNn/UXifa3Gv8n0r3GEZYyVG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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