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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5f8ca903468bf4e11b7fd15e2573c2b947e878e9affcf7a5f9c09387f318ec' 
  AND token = 'HhD/mIfsmp3eOw0GGy1yPG9lVv8+iFNrbVDKtsogeYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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