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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf1a3e006a9995a90d445b5fca2667f09753848b995f6975c1b5b7454544ccb' 
  AND token = 'rcCCYCfXPfb+gQelp8tp7q5Dtw6dDkYh+P9hTOF0zuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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