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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aec4f8e755ce48455f8f3be9a38ffedd3b5d2a40e40bfd0eec9230fae4daaed' 
  AND token = 'cHEMv907wctbx6b2/zTP+pT2PdBKnM9l5DCKN7gkb8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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