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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21cd78d477f1100f255d86cc2a7eedbc7b8887ef48fd026420f32a8fbc4d149' 
  AND token = 'EgJ1gkdTRF0YYJsoVXH53gFfH4VHe3u8t4YzolVYZhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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