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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cc4be98aa3fe69da294e6e6cad785c7f1c0c1bae332499b974892b0b51776e' 
  AND token = 'FCXpFxSrKpglFGm+iJXWSvfFA6QR88MW4x4vmI70AK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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