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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aade488d3e6a00e4d5ce08b44a5e770f766099c47e49c8cff281c195bd016d7d' 
  AND token = 'gQ94H5uxgUv3sK+uZz5S16hz6umQhVFMp8AGe19Prlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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